Outboard motor



June 13, 1944. KAREY 2,351,050

OUTBOARD MOTOR Original Filed April 11, 1939 15 Sheets-Sheet l' vINVENTOR. BY Q MUQLD KQREY ATTORNEY.

June 13, 1944. R KAREY 2,351,050

OUTBOARD MOTOR Original Filed April 11,1939 l3 Sheets-Sheet 2 IINVENTOR.

- QoMuA LD KR QEY f wcm ATTORNEY.

June 13, 1944. R. KAREY v 2,351,050

OUTBOARD MOTOR Original Filed April 11, 1939 13 Sheets-Sheet 3 I NV ENTOR.

, Qomumo KQQEY A TTORNEY.

June 13, 1944. R. KAREY OUTBOARD MOTOR Original Filed April 11, 1959 i5Sheets-Sheet 4 INVENTOR. 120M UQLD KQIEEY A TTORNEY.

June 13, 1944. a R. KAREY 2,351,050

' OUTBOARlj MOTOR 0riginal.Filed April 11, 1939 13 Sheets-Sheet 5 BY"QOMUQLD KQQEY A TTORNEY.

June 13, 1944. R. KAREY OUTBOARD MOTOR E v Original Filed April 11, l959l3 Sheets-Sheet 6 I 0Q Q O Q i W Y O O 3 I & INVENTR.

Y QOMUQLD Kf-IQEY ATTORNEY.

June 13, 1944;

R. KAREY OUTBOARD MOTOR Original Filed April 11, 1959 13 Sheets-Sheet 7fo m M MQWMM Wm M M fl kf 0 OK w R. KAREY OUTBOARD MOTOR Jurie13, 1944.

Original Filed April 11, 1939 15 Sheets-Shet 8 June 13, 1944. R. KAREY2,351,050

OUTBOARD MOTOR I Original Filed April 11, 1939 15 Shee'ts-Shet 10 IN VENTOR.

BY 'QOMUQLD 'KQEEY A TTORNEY.

.. R Y O E V WQAAAAAQ MY m M I El-.Il: E E O LEM Q m w 6 Q 0 a 5 i 2 Lfi 39 W .4 U f 2 M O 4 Z n a s a w 4 2 0 3 a l I a a 5 Z 2 f ICLVPY fl 3T: IT 0 4 a 7 l n 5 w I 1 0 y, 0 2 Z 5 v w vvv 4 6 I g 2 0 3 6 6 June13, 1944.

June 194.4.

OUTBOARDMOTOR R KARE E a l i :25

INVENTOR. v BY 'EOMUQLD KQQEY ATTORNEY.

Original Filed April ll, 1939 15 Sheets-Sheet 12 Patented June 13, 19442,351,650 ou'rno Moron ammo l or ies t eir to v. Am 1 ass! BendixAviation Corporation, South Bend, a corporation of Dela e applicationApril 11, 1939, Serial so; 267,218, now Patent No. 2,289,124, dated JulyI, 1942. Divided and this application Ian as, 1941, Serial No. 375,596-

3 (31111111118.v {CL 115-47).

This invention relates to power plants, and more particularly toapparatus for propelling a craft through water. The present applicationis a division oi my copending application Serial No.

267,218,-filed April 11, 1939, for Outboard motor.

Fig. 8 is a view taken substantially on the line l of Fig.4;

Fm. 9 is an enlarged sectional view showing the view showing Qsupercharger oi Fig. 2

Fig. 10 is an enlarged sectional a modified form of sealing mechanismfor the swash-plate member of Fig.9;

Fig. 11 is a view similar to Fig.- 10 showing a g further modified formof sealing mechanism;

A still further object is to provide a novel water inlet and circulatingsystem for cooling the en.-

gine and supercharger of an outboard motor to thereby increase theuseful life of said motor.

' Still another object is to provide a marine motor with a' novel watercirculating system.

Fig. 12 is another view; also similar to Fig. 10,

showing a still further modified form of sealing mechanism:

Fig. 13 is a sectional view of a portion of Fig. i,

showing the oil reservoir and one gear or an oil p mp;

Fig. 14 is a sectionalview taken substantially along a. planeparallel-to the plane or the section oi Fig. 13 through the other gearof said pump;

whereby inlet water under pressure is supplied for cooling the enginecylinders and the exhaust manifold.

A still further object is to provide a simple, rugged and efllcientwater pump and means ior y filtering and circulating the sea waterpumped thereby through the power means of a sea craft.

The above and iurther objects and novel features of the invention willmore fully appear from the following description when the same is readin connection with the accompanying drawings.

it is to be expressly understood, however, that the drawings are for thepurpose of illustration only and are not intended to define the limitsor the invention, reierence belngprlmarily had for this latter purposetothe appended In the s, wherein like reiee charcters reler to like partsthroughout the several Fig. 1 1s aside elevation of an outboard'motorembo ying thept invention;

' la- 2 is a sectional view 0! the power unit oi Fig.1;

Fig.3 is a view taken substantially on the line Marr es; 1. a p I, 4fisaviewtaken substantially on the line oi'Flg.l: l

r F18. :5 is aview taken substantially on the line 5-3 of H8. 4; Fig. 6ls-a view taken substantially on the line ome; l "(is a' view takensubstantially on the line Fig. 15 is a sectional view takensubstantially on the line 15-480! Fig. 14;

Fig; 16 is a. fragmentary view insection or the crankcase pressurerelief valve: 4

Fig.1! is a sectional view similar to a portion of Fig. 2 showing theexhaust and water outlet systems;

Fig. 18 is a. part sectional view taken substantially on the line i8l8of Fig. 17;

Fig. 19 is a sectional view taken substantially ontheline i9-l0of1l8.17;

Fig.

Fig. 21 is a sectional view taken substantially on the line 2 0-2: ofFig. 2c; i i

Fig. 22 is a sectional view taken substantially ontheline 22 ofFig. 21;I

Fig. 23 is a perspective view oi thedriving element of the pump shown inFigs. 21 and 22:

Fig. 24 is a, sectional view or the inlet to the water pump shown inFig. 21

Fig. 25 is a sectional view taken substantially on the line 25-45 ofFig. 21;

Fig. 26 is anenlsrged'sectional view of a DOT-e 'tion oi-Fig. 20:

' Fig. 2'! is an enlarged sideelevation, partly in section. of the boatattaching'bracket shown in Fig-28 is a view, partly in section, takensubstantially on the line 28-28101: Fig; 27-;

A Fig.- 29 is a sectional view taken'substantially on the line 29-29 0!Fig. 27: and 1 Fig. 30 is a part sectional view'taken substantially onthe line 311- 0! Fig. 27;

Referring more particularly to Fig; 1, it will "be observed thattheoutboard motor includes; a

power head it, havins an internal combustion;-

201s a sectional view or the lower unit of engine l2 which receives acombustible mixture 7 from a supercharger I4. A fuel tank i8 ispositione to' surround the supercharger I 4, a mag- I desired, be housedwithin a cover plate 28.

Intermediate and lower units 22 and 24, respectively, are carried by thepower head It to transmit power from the engine I2 to a propeller 25 todrive a boat to which the motor'is attached by means of a boat engagingbracket 26.

Referring now to Figs. 2 and 4, it will be observed that the engine I2is housed within three casings-a crank shaft casing 88 having a bracketreceiving boss 82: an engine cylinder housin 84, anda cylinder headcasing 88. These three casing members may be formed of any suitablematerial, such as cast aluminum or any suitable die-cast alloy. Ifdesired, reinforcin members may be provided in these castings, or

' 7 they may be formed of cast iron. The en e is preferably of theuniilow scavenging type wherein parallel interconnected cylinders 88 and48 are provided. Another similar pair of parallel interconnectedcylinders 42 and 44 are positioned beneath the cylinders 88 and 48. Eachpair of vertically spaced cylinders is provided with a spark plug 48 and48. The cylinders 88, 4c, 42 and 44 may be provided with liners 88, 4|,48 and 48 of suitable material in the form of inserts to provide asuitable surface to receive pistons 88, 82, 84 and 88 slidably mountedtherein.

A crankshaft 88 is mounted in the crankshaft casing 80, and ispreferably provided with three main bearings 88. The crankshaft 58 isprovided with oppositely disposed crank arms 82 and 84, and balancinglobes 88 and 88 to balance the unit. The pistons 82 and 88, and 56 and84 are connected to the crank arms 62' and 84. respectively, of thecrankshaft 88 by means of master and articulated rods Ill and 12,respectively. The main bearings (and the connecting rod bearings betweenthe master rods and the crank-arms 82 and 84 of the crankshaft 88 may beformed with suitable bearing surfaces, such as babbitt inserts.

The liners 88 and 48 of the-cylinders 88 and 42 may be provided withinlet ports 14 and 18, respectively, and the liners 4| and 48 of thecylinders 48 and 44 may be provided with exhaust ports 18 and 88,respectively (Fig. 8). The inlet ports 14 and I8 communicate with apassageway 82 (Fig. 7) leading to the supercharger l4. A baiiie'84serves to distribute the charge of combustible mixture from thepassageway 82 to the inlet ports 14. or 18 of the intake cylinders 88and 42. The exhaust ports 18 and 88 of the cylinders 40 and 44communicate with an expansion chamber 88 which leads to a downwardlydirected exhaust passageway 88 which discharges the exhaust gasesbeneath the surface of the water and to the rear of an anticavitationplate 88. I

Referring to Figs. 4, 5 and 6, it will be eb- 88 and 48 are interservedthat the cylinders connected at their outer ends or at the combustionchamber end. In order to permit sumcient area for the gases to flowfreely from the inlet to the exhaust cylinder, without providingundesirable clearance above the tops of the pie..- tons which wouldreduce the compression ratio by an, undesirable amount. the wall between"Le cyl nders may be 'slot 82 permits rapid flow of gases from the inletto the exhaust cylinders, and when the pistons are at the topdead-center the area of the slot 82 is so small as not to decrease the-compression ratio undesirably.

The pistons in the exhaust cylinders 48 and 44 are connected by themaster connecting rods III to the crank shaft 88. The master connectingrods describe a circular path which moves the exhaust pistons inproportion to the movement of the crankshaft. The pistons in the inletcylinders 88 and 42 are connected by the articulated rods I2 to arms 84carried by the master rods 18 connected to the crankshaft 88. Thearticulated rods 12 therefore describe an elliptical path which movesthe inlet pistons at varying speeds in the inlet cylinders as thecrankshaft rotates. This varying movement of the pistons which controlthe inlet and exhaust ports may be varied to give the desired results byincreasing or decreasing the length of the arms 84 carried by the masterrods 18. It has been found that one desirable arrangement is effectedwhen the linkage is proportioned in such a manner that the exhaust portsopen approximately 25 before the inlet ports open, and closebefore theinlet ports close by approximately 15 or 20".

as at 82. The .75

passageway 82. In

both cylinders.

In the operation of this engine, as the crank shaft 88 rotates in theclockwise direction, as

viewed in Fig. 4, the piston 82 carried by the master rod 18, uncoversthe exhaust ports I8 to exhaust the products of combustion. Since theexhaust ports 18 are located substantially around the full circumferenceof the cylinder 48, the exhaust gases are rapidly released from thecylinder, whereupon the exhaust cylinder pressure drops abruptly.

The piston 88 uncovers the inlet ports I4 after the exhaust ports 18 areopen for approximately 25. When the inlet ports I4 ope ,the exhaust gaspressure has dropped to practically atmospheric pressure and willtherefore ofler practically no resistance to the admission of the com-.bustible charge of fuel and air through the inlet ports 14. Thecombustible char e is formed inthe carburetor I88 and is supplied by thesupercharger l4 to the cylinders 88 through the view of the fact thatthe inlet ports 14 are located substantially around the fullcircumference of the cylinder 88, the

fresh charge will expel the remaining exhaust gases from the cylinders88 and 48, thereby eifecting' complete and thorough scavengins of therimproved by the characteristic absence of commingling of the freshcharge with the enhaust gases as it will be seen that, as the freshcharge enters around nearly the entire circumference of the cylinder, asolid column of gases will be formed which will push the inert exhaustgases ahead on the full length of the U-shaped cylinder volume. I

As the cycle continues the piston 82 will close the inlet ports 14 arethe exhaust ports I8 while still open, thus permitting a superchargingeffect since the cylinders will be filled with a fresh charge of fueland air at the mean supercharger pressure, which is of courseconsiderably above atmospheric pressure. The inlet ports I4 are closedapproximately 20 after the exhaust ports 18 are closed by the piston 82.

As the, cycle continues the charge is compressed in the outer end of thecylinders, bypass- This scavenging process is furmanner as by rivets.The supercharger ing over'the top of the cylinder wall and through theslot 02. When the pistons approach the top dead-center position, thecharge is ignited by thev spark plug which initiates the explosivechargeon the pistons which are thereby driven toward the bottom of thecylinders, thereby exerting a force on the crankshaft, 56 to rotate it.when the charge has been burned to a desired degree, the piston 52uncovers the exhaust ports I6 to permit the escape of the products ofcombustion to the expansion chamber 86 and to the downwardly directedexhaust passageway 60 which discharges the exhaust gases beneath thewater level andbehind the anti-cavitation plate 90.

It will be noted thatthe cylinders 42 and 44 are positioned beneaththecylinders 38 and and operate in the same manner as discussed above;however, the-cylinders 42 and 46 will be displaced 180 therefrom wherebywhen one group of pistons are at top dead-center the other group is atbottom dead-center.

The upper end ofthe crankshaft 58 is provided with a flange I whichcarries a flywheel I02 suitably connected thereto in any desired whichmay preferablybe of the swash-plate type is positioned above the engineper se.

Aplurality of driving pins I04 positioned in the flange I00 receive aflanged member I06 to drive the crankshaft I08 of the supercharger.Resilient bushings IIO are interposed in apertures in the flanged memberI06 and surround the driving pins I04 to cushion-vibration and absorbany surge action which might develop during the operation of thesupercharger. The'lower end of the supercharger crankshaft I08 restsupon an apertured resilient member II2 carried by the upper endof thecrankshaft 58. The member I I2 serves as a seal or gasket, sealing thelubricating oil pressure hole or lin against leakage loss.

The body of the supercharger is formed by.

. formed thereon. The lower wall I 20 is fixed to the upper end of theengine cylinder housing 36.

A gear member I26 having bevelled gears I30 is fixed to the lower wallI20 of the supercharger by any desired means, such as the screws I02.

The crankshaft I06 of the supercharger is provided with an offset crankI35 and is iournaled at the lower end in needle bearings I36 and at theupper end in ball bearings I30 (Fig. 2) to prevent vertical movement ofthe shaft I06. The bearingsisfi are secured by means of a cap I30 to theupper wall I22 of the supercharger.

The offset rotatable crank I34 carries a swashplate type supercharger.The plate I52 is mounted in a spherical bail member II I angularlyinterposed between the central portions of the lower and upper divergingwalls I20 and I22. Sealing means such, for example, as the conicalshaped members I66, are interposed between the spherical member I It andthe members I20 and I22. v I

The plate I62 and the member III are fixed to a flat gear member I68having bevelled gear means of a threadedcap member I55.

tending between the lower and upper diverging walls I20 and I22,respectively, to divide the chamber between the walls' I20 and I22 intoinlet and outlet passages positioned adjacent and on opposite sides ofthe partition member I56. Yielding means such as a spring I53 areemployed to urge the partition member I56into engagement with thspherical member I44.

In th operation of this device, a combustible charge f fuel and air issupplied by a carburetor I60 to the intake side of the superchargerunder the influence of the suction created therein. As the crankshaftI00of the supercharger I4 rotates, the offset crankil34 imparts anoscillatory or rolling movement to the plate I42 which moves between thewalls I20 and I22, and the gears I30 and I50 hold the plate fromrotation. A combustible charge of fuel and air is therefore drawn intothe supercharger from the carburetor, and is compressed by the plate Ithrough the passageway 82 to the inlet ports I4 and 16 of the intakecylinders 30 and 42.

It will be noted that the supercharger is double acting in that a chargeis drawn into it and compressed on opposite sides of the plate I42.

The time of maximum pressure discharge from the supercharger may betimed with reference to'the opening of the inlet ports 14 and I6 so -Amodifled sealing mechanism is illustrated in Fig. 10 wherein an annularmember I66 is provided with a plurality of annular grooves I63, and apiece of neoprene or other resilient material I10 is positioned abovethe member. I 66, and

, ployed to maintain the unit in the assembled relation. I

The additional modified embodiment illustrated in Fig. 12 incorporatesan annular member I18 having annular oil retaining grooves I60, and apiston ring member I02. yieldingly urged into engagement with thespherical surface of the member I66 (Fig. 9) by means of springs I86.

'Ihecarburetor I60 may be provided with a manually actuated choke valveI to supply an enriched mixture for starting purposes. Means are alsoprovided to supply liquid fuel to the intake cylinders. This means maytake the form of a manually actuated push button I92 to induce a flow ofliquid fuel through a fuel conduit I94 to a point adjacent the intakeports i6, 16, which in the form shown in Figs. '7 and 8 is at anextremity 82a of conduit 62, the extremity being adjacent anintermediate short passage way which is in communication with saidports.

I42 and discharged These grooves serve to trap oil, thereby The assemblyis A magneto l4 may be provided to supply the necessary spark to ignitethe compressed charge in the cylinders of the engine. The magneto may bepositioned above the supercharger M, the supercharger shaft I44 beingextended upwardly to accommodate it. The magneto includes a rotor memberI44 fixed to the shaft I44. A plurality of magnets H4 are carried by therotor member I44 and are preferably positioned to rotate inside of astator member 200. Associated with the stator member are a pair of coiland condenser members 242 and 204, respectively, oper'ably connected tobreaker points 204 positioned to be actuated by an eccentric 244 fixedto the shaft The spark and the throttle of the carburetor may becontrolled by a single lever 2l4-operably connected to a throttleactuating lever 2l2. When the lever 214 is in the position shown in Fig.3, the throttle of the carburetor is closed and the spark is inapproximately 'the mid position. As the lever 2H! is moved to the left(Fig. 3) the spark is retarded, and the ,throttle remains closed. Asthis lever is moved to the right from the mid position, the spark isadvanced and the throttle valve is progressively opened. A springKuzmitz, Serial No. 180,264, filed December 17,"

1937, may be employed for this purpose.

Power from the engine l2 may be transmitted to the propeller 24 by meansof a generally vertically disposed shaft 224 fixed to the crankshaft 44of the engine and extending through the units 22 and 24 to drive agenerally horizontally extending shaft 222 to which thepropeller 24 isfixed.

'Ihe'unit 22 through which the shaft 224 extends forms an oil reservoir224. Means, such for example, as a gear pump, may be provided to supplyoil. as a lubricant, to the engine l2 and to the supercharger i4. Theupper end of the shaft 224 may be splined to receive the lower end ofthe crankshaft 44 and a gear 224 ofthe oil pump. The gear 224 mesheswith an idler gear 224 mounted on a pin 244 in the unit 22. An

inlet to the suction side of .the oil pump is provided in the form' of adownwardly directed duct -242 communicating with the bottom of the oilreservoir 224 by way of a screened inlet plug 244.

The shaft 224 may be provided with an oil seal at the base of thereservoir where it passes therethrough in order to prevent loss oflubricating oil at this point.

The'pressure or discharge side of the pump communicates with a pressurerelief valve 224 which may be in the form of an adjustable springpressedplunger wherein the spring is compressed to permit oil to return to thereservoir 224, by way ofa duct 244 when the pressure developed by thepump exceeds a predetermined value. The dischargeside of the pump alsocommunicates wiLh' an oiif delivery duct 244.

The duct 2'44 communicates with passageways assaoeo of the main bearings44 of the engine. The crankshaft 44 is provided with angularly disposedpassageways 244 which transmit oil to lubricate the bearings ofconnecting rods III and 5 12. A passageway 244 formed in" the crankshaft54 communicates through the apertured memberli: with a central duct 244in the supercharger shaft I" which transmits oil to lubricate thesupercharger bearings I44, I42 and I44 and also the other moving parts.of the supercharger including the member I44. The excess oil suppliedthrough the duct 244 in the shaft I48 is drained from the superchargerthroughoriflces 254 and 242 to the engine crank case, and from theseback to the oil reservoir 224 through an opening 252.

The reservoir 224 may be filled with oil by removing a cap 254 from anoil tube 244 and pouring oil therein. The tube 244 communicates with thecrank case of the engine which in turn communicates with the reservoir224 through the opening 252. A pair of spaced plugs may be provided inthe upper portion of the reservoir 224 to enable the operator toascertain the level of the oil in the reservoir by removing the plugs.

A crank case pressure relief -valve 244 may be provided to allow excesspressure within the crank case to be relieved: A riser 242 supports thepressure responsive valve- 244 and is provided :m with a filter 264(Figure 8) to prevent the escape of oil from the'crank case.

The engine cylinders and expansion chamber may be cooled by circulatingwater through passages adjacent their walls. The water for cooling aspurposes may preferably be supplied by a pump driven by the propellershaft 222; however, if desired, it may be driven by the shaft 224.

The water pumping structure preferably comprises two units surroundingthe drive shaft, and 4 each forming a part of the drive shaft housing:

however, if desired, a single piece may. be employed. An annular member214 surrounding the propeller shaft 222 supportma ball bearing race 212which receives the propeller shaft 222. The member 210 is provided withan upstanding member 214 spaced a small distance from the rear 'face ofthe housing 24 and beneath the anti-cavitation plate. A water seal 214may be carried by the member 214 to prevent water from enterim; the gearcase of the unit 24. v

' An annular shaped member.244 having a pump housing member 242surrounds the propeller shaft 222 and may be clamped to the member 210and the lower end of the housing 24. The member 240 is provided with anupstanding member 244 which underlies. the anti-cavitation plate 80 andis shaped to cooperate with the body of the unit 24 and the member 214to present a section which will not unnecessarily obstruct the flow ofwater thereover.

The member 214 is provided with an inlet passage 244 aligned with asimilar inlet passage 244 formed in the member 244. A screen 244 isinterposed between'the passages 244 and 244 to prevent dirt or anyforeign particles from enterhis the pumping structure. The inlet passage244 in the member'244 communicates by way of a passage 242 with theinlet 244 (Fig. 21) of the p glhlzstructuigi ma Dump s cture comprise aneccen driving member .444 fixed to the propeller 222. Theeccentricdriving member 444 receives an. annular pumping member .442preferably formed-of resilient material such, for example. as

242' which Oil to lubricate the bearings neoprene or other suitableyielding material. A-

resilient reinforcing collar or insert 312 of steel or other stiff.springy material may be embedded in the yielding material of pumpingmember 302, to prevent undue distortion or injuries thereto whileoperating at high speeds. The pumping member 332 is slotted on one sideas shown at 304 to receive a restraining vane 308 of an annular insert308 formed of bronze or other suitable material. The vane 306 cooperateswith the pumping member-302 to separate the inlet 29a tothe Space withinthe insert 303 from an outlet 3 therefrom. The outlet 3 communicateswith a pipe M3 projecting into the members. 214 and 283.

The insert 308 is concentric with reference to the propeller shaft 222.The pumping member 382 is formed with a plurality of longitudinallyconical resilient members 362 may be interposedextending slots 310formed on its inner surface to permit water to flow through it from theoutside to lubricate the eccentric driving member 300 to prevent thepumping member 302 locking therewith. A spring M3 yieldingly urges aplate 320 into engagement with the pumping member 302 and with theinsert 303 to maintain the unit in the assembled relation.

In the operation of this pump water flows into the space between themember 210 and the housing 24, and also around the member 284 beneaththe. anti-cavitation plate 30 to the inlet passage 285. The water thenflows through the screen 280, through the passage 282 tothe inlet pas- Isage 298 to the pump.

The propeller shaft 222 rotates theeccentric driving member 300 whichinduces the pumping member 302 to move in the insert 30-8, pivotingabout the restraining vane 306 to exert suction at the inlet port 294and to exert pressure on the water to discharge it through the outletport 3M as the pumping member 302 moves toward the outlet port. I

The water supplied by the pump to the pipe 3H5 is directed upwardlythrough a passageway 330 in the housing 22 to the water passages 332 inthe engine cylinder housing member 34. Referringto- Fig. 8, it will beobserved that the water also fills a chamber 333 adjacent the expansionchamber 83 which receives the exhaust gases from the exhaust cylinders40 and 44 of the engine. The water also fills chambers 338 in thecylinder head section 36 of the engine. When the water reaches apredetermined level in the chambers 332, 333 and 333, it overflows anupmember 332 which carries a tiller or steering member 333. The member352 may be attached to the crankshaft casing 30 of the motor assembly bymeans of bolts, 356. oppositely disposed resilient members 338 may beinterposed between the bolts 356 and the member 352 to absorb vibrationdeveloped by the engine to prevent it from being transmitted to thetiller SEldand the boat.

The lower end of the shaft 350 may be received in an apertured boss 360carried by the intermediate unit 32. A pair of oppositely disposedbetween the lower end of the shaft 350 and the boss 380 to absorbvibration and to prevent it from being transmitted to the boat and thetiller 354. The resistance to the steering operation may be varied byadjusting the nut 366' carried at the lower end of the shaft 350.

The intermediate section of the shaft .353 is provided with a tubularmember 368 fixed thereto in any desired manner as by casting it on theshaft 350. Themember 368 is provided with a generally verticallyextending reinforcing web 310 and upper and lower generally horizontallyextending reinforcing webs 312 and 314, respectively.

The upper reinforcing'web 312 is provided with flattened surfaces 316 toreceive bracket members 318 which engage the transom of a boat, and areprovided with adjusting screws 380 to securely fasten the motor to theboat. The brackets 318 are attached to the reinforcing web 312 of themember 368 by means of a bolt 382.

The block 388 may be moved to varying positions a in the slot 386 tovary the, angular-relation between the bracket members 318 and the shaft350 to accommodate the motor to use with boats having transoms set atvarying angles.

While the inventionhas been described with particular reference to onedesirable embodiment, it is not intended tozlimit the invention to thefeatures illustrated and described, as many changes can be madethereinwlthout departing from the spirit of the invention as defined bythe following claims.

What is claimed is:

1. In an outboard motor having a drive shaft and propeller shaft incoacting relationship and a housing having streamlined front andtrailing edges enclosing said drive shaft and a part of said propellershaft, the combination with said propeller shaft and housing of a pumpcomprising an annular resilient pumping element having a slottedperipheral portion, means embedded within said element to preventdistortion thereof, an eccentric secured to said propeller shaft and inoperable engagement with said element, a pump housing secured to saidfirst mentioned housing adjacent said first mentioned housings trailingedge, said pump housing enclosing a part of said propeller shaft, achamber within said pump housing within which said element is enclosed,a boss extended from an inner wall of said chamber into the slot of saidelement whereby a pumping action is imparted to said element duringeach' revolution of said propeller shaft, said element, eccentric andchamber within said pump housing being of such sizeas to permit theexternal streamlining of said pump housing at its point of jointure withsaid first mentioned housing in substantially the same vertical andhorizontal planes, and a propeller secured to said propeller shaftadjacent the rearward edge of said pump housing, whereby the portion ofsaid pumphous ing extended rearwardly from said first men tionedhousings trailing edge acts to eliminate operational slip stream andpropeller cavitation is lessened.

2. In an outboard having a drive shaft and propeller shaft in coactingrelationship and a housing having streamlined front and trailing edgesenclosing said drive shaft and a part of said propeller shaft, thecombination with saidpropeller shaft and housing of a pump comprising,an annular resilient pumping element having a slotted peripheralportion,means embedded within said element to prevent distortion thereof, aneccentric secured to said propeller shaft and in operable engagementwith said element, a pump housing secured to said first mentionedhousing adjacent said first mentioned housings trailing edge andenclosing a part of said propeller shaft, a chamber within said pumphousing within which said element is enclosed, a boss extended from. aninner wall of said chamber into the slot of said element whereby apumping action is imparted to said element during each revolution ofsaid propeller shaft, and said velement, eccentric and chamber withinsaid pump housing being of such size as to permit the externalstreamlining of said pump housing at its point of jointure with saidfirst mentioned housing in substantially the same vertical andhorizontal planes.

20 cillatory pumping action is imparted to said element during eachrevolution of said shaft.

ROMUALD KAREY.

